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u <br />n <br />TABLE 2 <br />Sources of Drainage Areas <br />a Determined from published US Army Corps of Engineers and FEMA information <br />b Determined from planimetering and published tributary information <br />C USGS gage information <br />Figure 4 shows the study reach and each of the hydrologic analysis points listed in Table 2. <br />2.5 Flood Characteristics <br />Major flooding in the Colorado River basin has been primarily the result of rapid snowmelt which <br />typically begins in late April. Snowmelt flooding can continue into early July. Flooding can also <br />occur from rainfall on snowmelt in late winter or early spring. Due to the small areal extent and <br />limited duration of thunderstorms, they do not typically constitute a major flood threat on streams <br />as large as the Colorado River. They do, however, pose a problem for some of the smaller <br />tributaries in the Colorado River basin. <br />Snowmelt flooding is characterized by moderate peak flows, large volume of runoff, long <br />duration, and diurnal fluctuation of flow. Flooding from general rainfall alone, though <br />7 <br />COLORADO RIVER HYDROT.OGIC ::ANALYSIS POINTS <br />HYDROLOGIC< <br />LOCATION <br />DRAINAGE <br />D A <br />POINT <br />AREA (D A) <br />SOURCE <br />C1 <br />ABOVE RIFLE CR <br />6730 mil <br />a <br />C2 <br />BELOW RIFLE CR <br />6930 miZ <br />a <br />C3 <br />ABOVE PARACHUTE CR <br />7130 mil <br />b <br />C4 <br />BELOW PARACHUTE CR <br />7330 mil <br />b <br />C5 <br />DEBEQUE GAGE <br />7370 mil <br />c <br />C6 <br />BELOW ROAN CR <br />7895 miZ <br />b <br />C7 <br />CAMEO GAGE <br />8050 miZ <br />c <br />C8 <br />BELOW PLATEAU CR <br />8700 miZ <br />a <br />C9 <br />PALISADE GAGE <br />8753 miZ <br />c <br />CIO <br />BELOW GUNNISON RIVER <br />16853 miZ <br />b <br />C l 1 <br />FRUITA, FEMA D/S STUDY LIMIT <br />17100 miZ <br />a <br />C12 <br />ABOVE SALT WASH <br />17429 miZ <br />b <br />C13 <br />STATELINE GAGE (1.5 MI U /S) <br />17843 miZ <br />c <br />Sources of Drainage Areas <br />a Determined from published US Army Corps of Engineers and FEMA information <br />b Determined from planimetering and published tributary information <br />C USGS gage information <br />Figure 4 shows the study reach and each of the hydrologic analysis points listed in Table 2. <br />2.5 Flood Characteristics <br />Major flooding in the Colorado River basin has been primarily the result of rapid snowmelt which <br />typically begins in late April. Snowmelt flooding can continue into early July. Flooding can also <br />occur from rainfall on snowmelt in late winter or early spring. Due to the small areal extent and <br />limited duration of thunderstorms, they do not typically constitute a major flood threat on streams <br />as large as the Colorado River. They do, however, pose a problem for some of the smaller <br />tributaries in the Colorado River basin. <br />Snowmelt flooding is characterized by moderate peak flows, large volume of runoff, long <br />duration, and diurnal fluctuation of flow. Flooding from general rainfall alone, though <br />7 <br />